Commercial Vehicles8 min read•Published 2026-06-18
Commercial Truck VIN Decoding: GVWR Classes 1 through 8 Explained
Demystify commercial truck VINs. Learn how Class 1 to Class 8 Gross Vehicle Weight Ratings, air brake safety codes, and tandem axles are encoded.
The Federal Gross Vehicle Weight Rating (GVWR) System
Unlike passenger cars where VINs primarily denote body trim and engine options, commercial medium and heavy-duty truck VINs are strictly structured around safety weight classifications and brake system redundancies.
Federal Commercial Truck Classes (Class 1 to 8)
- Class 1 (0 to 6,000 lbs): Compact pickups, light SUVs, and minivans (e.g., Ford Maverick, Toyota RAV4).
- Class 2 (6,001 to 10,000 lbs): Full-size half-ton pickups and cargo vans (e.g., Ford F-150, Chevy Silverado 1500, Ram 1500).
- Class 3 (10,001 to 14,000 lbs): Heavy-duty one-ton trucks (e.g., Ford F-350, Ram 3500, Chevy 3500HD).
- Class 4 (14,001 to 16,000 lbs): Medium-duty cab-chassis box trucks (e.g., Ford F-450, Isuzu NPR).
- Class 5 (16,001 to 19,500 lbs): Heavy commercial utility trucks and ambulances (e.g., Ford F-550, Ram 5500).
- Class 6 (19,501 to 26,000 lbs): Large municipal box trucks and single-axle school buses (e.g., Freightliner M2 106, International MV).
- Class 7 (26,001 to 33,000 lbs): Heavy refuse trucks and city delivery tractors requiring commercial driver licenses (CDL).
- Class 8 (33,001+ lbs): Severe-duty highway tractor-trailers, cement mixers, and dump trucks (e.g., Peterbilt 389, Kenworth W900).
Brake System Coding in Commercial VINs
Position 4 or 5 in commercial truck VINs typically denotes the braking configuration:
- Class A: Hydraulic disc/drum brakes.
- Class B: Hydraulic brakes with electronic anti-lock brake systems (ABS).
- Class C & D: Full pneumatic air brakes with dual air circuit safety reservoirs.